How would you change the Sony Z Series Walkman?

Sony's Walkman Z had a frustratingly delayed journey to western shores, and when it arrived it offered a solid, if uninspiring portable media player. It certainly bested the competition in some areas, but the easily-chipped bodywork and closed-off Walkman apps that wouldn't play nice with Google Music didn't help those already invested in the rival service. Still, those you were desperate to avoid buying an iPod Touch who splashed out on one of these, how did you find it? If Kaz Hirai was asking your opinion on how to build the world's greatest Walkman PMP, what would you say?